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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5ad40b248852a98e49c693dd483caa8e2e4133c85d10f306df63b39dba8249' 
  AND token = 'cYbTrfhwuTwadMSgNoI4Tun/Kn5cS5fuEhjGPA9OCqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}